Manufacture of yarn



Patented Apr. 29, 1947 UNITED STATES PATENT OFFICE 2,419,774

MANUFAoTUaE oF YARN Malcolm Hain, Montclair, N. J. Application March 15, 1946, Serial No. 654,704 2 claims. (ci. 19-1'30) This invention relates to sliver-drawing apparatus of the same class as that set forth in my Patent No. 2,197,638. In my said patented apparatus, between the pairs of drawing and retaining rolls there is a single driven roll and the means coactive therewith to control the draft includes two pressure rolls which, during the actual drawing, are both held in sliver-gripping relation to the driven roll. In the apparatus of the present invention the driven roll is replaced by a pair of driven rolls and the two pressure rolls are replaced by a single pressureroll which, during the actual drawing, is held in sliver-gripping relation to s uch two driven rolls. Further, instead of the pressure required for gripping the sliver being attained by resort to a lever-and-carrier system of the type disclosed in my said patent, a lever-and-carrier system of the type disclosed in my copending application Serial No. 609,531 is employed. The apparatus as' thus constructed involves certain advantages as compared to the apparatuses of my said patent and application which will be hereinafter explained.

In the drawings,

Fig. 1 is a side elevation, partly in section, of a portion of a sliver-drawing apparatus constructed in accordance with my present invention;

Fig. 2 is an elevation of a part of the gearing as viewed from the right in Fig. 1;

Fig. 3 is a plan of a driven roll and the pressure rolls of two adjoining drawing units; and

Fig. 4 is a plan of the carrier and a fragment of the weighted lever by which it is partly supported.

The drawing rolls I-Ia and retaining rolls 2-2a are substantially the same in construction and function as in my said patent, as are also the following parts: the spout 3 through which the sliver a passes to the drawing rolls; the weighted lever (forming withthe frame a part of the supporting structure) for holding the roll 2a against roll 2; and the parts mounted on the portion 5 of the frame, as lever 6, link l, bell-crank lever 8 and depending link 9 which at 9a is adapted for lifting lever Il when lever 6 is moved to coact with a iixed member III to clamp the sliver. On the frame portion 5 is the usual guide II for the sliver.

Between the rolls I-Ia and 2--2a is arranged a pair of superposed shafts I2, here with their axes in a common vertical plane. They are asthe same speed but such speeds of the rolls I-Ia reduced portions, as I2a,

sumed to be driven at as will be between the and 2-2a, they having providing journals received 'in bearings I3 of 55 the frame. They provide what I term driven rolls.

At I4 is a pressure roll. This is journaled in the forked terminals of a forked carrier I5 which is pivoted at its rear end to the depending forward arm I6a of a lever I6 fulcrumed at IIa in a, bracket Il fast to a portion I8 'of the frame l and having a depending rear arm carrying a weight I9. The'fork at I5a of carrier,l I5 serves to guide the sliver. 'I'he carrier at I'Ib is slid. ingly supported by bracket I 'I and so is subject to forward thrust by lever I6. The carrier has what I term bearing means I5b for the trunnions Ila of the pressure roll and which face the latter, and forward of such means it has sur-l faces I5c forming a guideway for the trunnions and which slopes downwardly toward said roll `so that normally or even when the carrier is retracted, said roll (by its own weight) is urged to coact with the driven rolls to grip the sliver.

The shaft Ia: of roll I being suitably driven, a gear I thereon drives a gear l1 forming a unit with a smaller gear III which drives a gear IV fast to the shaft 2a: of retaining roll 2 and formed as a unit with a smaller gear V which drives a gear VI formed as a unit with a larger gear VII which drives the gears VIII-VH1 having the same pitch-diameter and fast to the rolls I2 and lapping each other (Fig. 1), the gearing being thus such that the retaining rolls will be than the drawing rolls and the driven rolls I2 and pressure roll I4 will be driven at a speed between those of such drawing and retaining rolls.

The operation is generally similar to that of the apparatus of my said patent as will be evident to those skilled in this art, butit involves these further advantages in respect to the groupof three rolls between the drawing and retaining roll pairs: In the first place, since two oi such rolls, instead of only one, are driven such group of rolls acts more effectively to control the sliver and hence what I have -in my said patent termed the vagrant fibers thereof. In the second place, one

of the three rolls being of larger diameter than the other two thus to obtain an extended tractive contact with the sliver, since such roll is in the present instance the (single) pressure roll possibility oi stray fibers becoming wound around its trunnions I 4a and thus ha'ving to be removed from time to time is considerably reduced.

'Having thus fullyI described my invention what I claim is:

1. In the art of drawing sliver, the combination, with mechanism for imparting tractive eil'ort to the sliver including supporting structure, a pair of drawing rolls and a pair of retaining rolls jourdriven more slowly naled in said structure; a pair of driven rolls Journaled in said structure between said roll pairs, all said rolls being substantially, parallel, and means to rotate one drawing roll and one retaining roll, the former at the superior speed, and also rotate the driven rolls at a common speed between those of the latter drawing and retaining rolls, of means coactive with said driven rolls to control the draft including a pressure roll substantially parallel with and normally urged to coact with both driven rolls to grip the sliver, a carrier in which the pressure roll is journaled and being in part supported by said mechanism and having bearing means lateral of the path ofthe sliver and facing the driven rolls and abutting the pressure roll, and a lever to which the carrier is pivoted to oscillate therewith independently of the pressure roll and also supporting the carrier vand normally urged in the direction to urge MAICOIM BAIN.

REFERENCES CITED The following references are of record in the 10 file of this patent:

UNITED sTATEs PATENTS Number the carrier toward said driven rolls, said car. 20 Number rier having a guideway for supporting the pressure roll when the carrier is retracted.

Name Date Perutz Nov. i5, 1927 Kooistra sept. 11, 1934 Morton July 23, 1940 Hain Apr. 9, 1946 FOREIGN PATENTS Country Date British 1893 

